US20150242013A1 - Touch screen - Google Patents
Touch screen Download PDFInfo
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- US20150242013A1 US20150242013A1 US14/427,080 US201314427080A US2015242013A1 US 20150242013 A1 US20150242013 A1 US 20150242013A1 US 201314427080 A US201314427080 A US 201314427080A US 2015242013 A1 US2015242013 A1 US 2015242013A1
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- touch screen
- direction wiring
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Classifications
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- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
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- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
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- G—PHYSICS
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- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04111—Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
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- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04112—Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
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- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
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- G06F3/0412—Digitisers structurally integrated in a display
Definitions
- the present invention relates to a touch screen.
- a touch panel is a device that detects touch with a finger or the like to specify position coordinates of a position where the touch panel is touched.
- the touch panel has attracted attention as excellent user interface means.
- Various types of touch panels such as a resistance film type, an electrostatic capacitive type and the like have been produced.
- the tough panel is made up of a touch screen incorporating a touch sensor, and a detection device that specifies position coordinates where the touch panel is touched, based on a signal from the touch screen.
- the projected capacitive type touch panel can detect touch even when a front surface side of the touch screen where the touch sensor is incorporated is covered with a protective plate such as a glass plate having a thickness of about several millimeters.
- This type of touch panel is excellent in robustness, because the protective plate can be arranged in a front surface. Moreover, the detection of touch is enabled when gloves are worn. In addition, since it has no movable portion, it has a long service life.
- the projected capacitive type touch panel generally includes a plurality of row-direction wirings provided so as to extend in a row direction, which configures a first electrode, and a plurality of column-direction wirings provided so as to extend in a column direction, which configures a second electrode.
- a field change between the row-direction wiring and the column-direction wiring that is, a change in an inter-wiring capacitance of the row-direction wiring and the column-direction wiring (hereinafter, simply referred to as an inter-wiring capacitance) is detected to thereby specify position coordinates where the touch panel is touched.
- This detection method is generally called a mutual capacitance detection method (e.g., refer to Patent Document 2).
- a display area of the display device is covered with the row-direction wiring and the column-direction wiring included in the touch screen.
- transmission of display light becomes ununiform, or a reflectivity of outside light becomes ununiform, which may cause a moire phenomenon, or may allow wirings to be visually recognized.
- a touch screen of which existence is difficult for the user to feel such as a touch screen in which wirings are difficult to be visually recognized, is more preferable.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2012-103761
- Patent Document 2 Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 2003-526831
- the present invention is achieved in order to solve the above-described problems, and an object of the present invention is to provide a touch screen in which an inter-wiring capacitance between row-direction wiring and column-direction wiring is small, and a change of the inter-wiring capacitance when the touch screen is touched by an indication body is large. Moreover, to provide a touch screen in which visibility is enhanced is a secondary object.
- a touch screen according to the present invention is a touch screen covered with a mesh-like wiring pattern including upper and lower two layers including row-direction wiring and column-direction wiring, wherein the row-direction wiring includes a first portion and a second portion having a wiring width smaller than a wiring width of the first portion, a wiring width of the column-direction wiring is smaller than a length in a row direction of the second portion of the row-direction wiring, the row-direction wiring and the column-direction wiring intersect in the second portion of the row-direction wiring, gaps are formed between the row-direction wiring and the column-direction wiring in planar view in an intersection portion of the row-direction wiring and the column-direction wiring, the touch screen further includes floating wiring that fills the gaps in planar view, the floating wiring is formed in the same layer as the row-direction wiring or the column-direction wiring, and the floating wiring is insulated from the row-direction wiring and the column-direction wiring.
- providing the floating wiring enables the gaps each having a width of the floating wiring to be provided between the row-direction wiring and the column-direction wiring without degrading visibility.
- providing the floating wiring can reduce the inter-wiring capacitance between the row-direction wiring and the column-direction wiring.
- a change amount of the inter-wiring capacitance when the touch screen is touched can be increased.
- touch detection sensitivity can be enhanced, as compared with a case where the floating wiring is not provided.
- FIG. 1 is a perspective view of a touch screen according to a first embodiment.
- FIG. 2 is a plan view of the touch screen according to the first embodiment.
- FIG. 3 is a plan view of a lower electrode of the touch screen according to the first embodiment.
- FIG. 4 is an enlarged view of an area A in FIG. 3 .
- FIG. 5 is a plan view of an upper electrode of the touch screen according to the first embodiment.
- FIG. 6 is a plan view of the lower electrode and the upper electrode of the touch screen according to the first embodiment.
- FIG. 7 is a view showing a relationship between detection sensitivity and a floating wiring width.
- FIG. 8 is a plan view of a lower electrode and an upper electrode of a touch screen that does not include floating wiring.
- FIG. 9 is a view showing a relationship between an optimal floating wiring width and a thickness of a transparent substrate.
- FIG. 10 is a view showing a relationship between a disconnection portion of floating wiring and a relative value of an inter-wiring capacitance.
- FIG. 11 is a plan view of a lower electrode of a touch screen according to a second embodiment.
- FIG. 12 is an enlarged view of an area B in FIG. 11 .
- FIG. 13 is a plan view of an upper electrode of the touch screen according to the second embodiment.
- FIG. 14 is an enlarged view of an area C in FIG. 13 .
- FIG. 15 is a plan view of the lower electrode and the upper electrode of the touch screen according to the second embodiment.
- FIG. 16 is a view showing a unit pattern of wiring in a touch screen according to a third embodiment.
- FIG. 17 is a plan view of a lower electrode of the touch screen according to the third embodiment.
- FIG. 18 is an enlarged view of an area D in FIG. 17 .
- FIG. 19 is a plan view of an upper electrode of the touch screen according to the third embodiment.
- FIG. 20 is an enlarged view of an area E in FIG. 19 .
- FIG. 21 is a plan view of the lower electrode and the upper electrode of the touch screen according to the third embodiment.
- the touch screen 1 in the present embodiment is a projected capacitive type touch screen.
- FIG. 1 is a perspective view of the layer structure of the touch screen 1 of the present embodiment.
- An upper surface layer of the touch screen 1 is a transparent substrate 10 made of a transparent glass material or transparent resin.
- an upper electrode 30 is formed on a back surface of the transparent substrate 10 .
- an interlayer insulation film 11 is formed so as to cover the upper electrode 30 .
- the interlayer insulation film 11 is a transparent insulation film such as a silicon nitride film, a silicon oxide film and the like.
- a lower electrode 20 is formed on a back surface of the interlayer insulation film 11 .
- a protective film 12 is formed so as to cover the lower electrode 20 .
- the protective film 12 is an insulating film having translucency such as a silicon nitride film and the like, similar to the interlayer insulation film 11 .
- the upper electrode 30 includes a plurality of column-direction wirings 31 made of a transparent wiring material such as ITO (Indium Tin Oxide) and the like, or a metal wiring material such as aluminum and the like.
- the lower electrode 20 includes a plurality of row-direction wirings 21 made of the same material as the column-direction wirings 31 .
- the column-direction wiring 31 and the row-direction wiring 21 are not shown so as to have a mesh-like structure as described later.
- the column-direction wiring 31 and the row-direction wiring 21 each have a multilayer structure of an aluminum-based alloy layer and a nitride layer thereof. This can make a wiring resistance small and increase a transmittance of light in a detectable area.
- the column-direction wiring 31 is arranged in an upper layer of the row-direction wiring 21 , a positional relation thereof may be reversed, so that the row-direction wiring 21 is arranged in an upper layer of the column-direction wiring 31 .
- a user performs operation by touching the transparent substrate 10 , which is a surface of the touch screen 1 , with an indication body such as a finger and the like.
- an indication body such as a finger and the like.
- an inter-wiring capacitance between the row-direction wiring 21 and the column-direction wiring 31 under the transparent substrate 10 is changed. This capacitance change is detected, by which it can be specified at which position inside the detectable area the transparent substrate 10 is touched.
- FIG. 2 is a plan view of the touch screen 1 of the present embodiment.
- the detectable area of the touch screen 1 is made up of the plurality of row-direction wirings 21 extending in a lateral direction (row direction), and the plurality of column-direction wirings 31 overlapping in planar view on a front side of the row-direction wirings 21 and extending in a longitudinal direction (column direction).
- the respective row-direction wirings 21 are connected to a terminal 8 to be connected to outside wiring by lead lines R 1 to R 6 .
- the respective column-direction wirings 31 are similarly connected to the terminal 8 to be connected to the outside wiring by lead lines C 1 to C 8 .
- the lead lines R 4 , R 5 are arranged along an outer circumference of the detectable area. Moreover, the lead lines R 3 , R 6 are arranged along the outer circumference of the detectable area, and after reaching the lead line R 4 or the lead line R 5 , they are arranged along the lead lines R 4 , R 5 . In this manner, the lead lines RI to R 6 are arranged close to an outer circumferential side of the detectable area. The lead lines C 1 to C 8 are also arranged close to the outer circumferential side of the detectable area in order from the lead line closest to the terminal 8 .
- Arranging the lead lines R 1 to R 6 , C 1 to C 8 as close as possible to the outer circumferential side of the detectable area can suppress a fringe capacitance between the display device to which the touch screen 1 is attached, and lead wiring.
- the above-described arrangement of the lead wiring can reduce influence on the lead wiring by electromagnetic noise caused from the display device to which the touch screen 1 is attached.
- dummy lead wiring 40 to which a reference potential of ground or the like is supplied is provided between the lead wirings.
- Providing the dummy lead wiring 40 in this manner can largely reduce the inter-wiring capacitance between the lead line C 8 and the lead line R 6 , and thus, even when the indication body such as a finger touches this portion, misdetection can be prevented.
- FIG. 3 is a plan view of the lower electrode 20 in which a vicinity of an area where the row-direction wiring 21 and the column-direction wiring 31 overlap in planar view is enlarged.
- FIG. 4 is an enlarged view of an area A in FIG. 3 .
- FIG. 5 is a plan view of the upper electrode 30 in which a vicinity of the area where the row-direction wiring 21 and the column-direction wiring 31 overlap in planar view is enlarged.
- FIG. 6 is a plan view of the area where the row-direction wiring 21 and the column-direction wiring 31 overlap in planar view.
- a lateral direction is the row direction
- a longitudinal direction is the column direction.
- FIGS. 3 to 6 schematically show a wiring pattern, and thicknesses and intervals of the wirings are different from an actual situation.
- the row-direction wiring 21 included in the lower electrode 20 is formed of mesh-like wiring.
- the mesh-like wiring is made by repetition of conducting wires extending in a direction inclined at 45° with respect to the row direction, and conducting wires extending in a direction inclined at 45° in an opposite direction with respect to the row direction.
- blank areas extending in the column direction from a central portion of the row-direction wiring 21 are areas where the column-direction wiring 31 is arranged in planar view. Moreover, in the central portion in FIG. 3 , an area where an interval of a mesh of the row-direction wiring 21 is larger is an area where the row-direction wiring 21 overlaps the column-direction wiring 31 in planar view.
- the row-direction wiring 21 has a narrow width in an intersection portion with the column-direction wiring 31 .
- the row-direction wiring 21 is made up of a first portion E 1 and a second portion E 2 .
- a wiring width W 2 of the second portion E 2 is smaller than a wiring width W 1 of the first portion.
- a wiring width We of the column-direction wiring 31 shown in FIG. 5 is smaller than a length in the row direction M 2 of the second portion E 2 of the row-direction wiring 21 .
- the row-direction wiring 21 and the column-direction wiring 31 intersect around a center of the second portion E 2 of the row-direction wiring 21 .
- gaps each having a width L in the row direction in planar view are provided between the row-direction wiring 21 and the column-direction wiring 31 in the intersection portion of the row-direction wiring 21 and the column-direction wiring 31 .
- the lower electrode 20 further includes floating wiring 21 a so as to fill these gaps in planar view.
- the floating wiring 21 a is formed of mesh-like wiring similar to the row-direction wiring 21 .
- the floating wiring 21 a is divided and insulated by disconnection portions 21 c from the row-direction wiring 21 formed in the same layer.
- the floating wiring 21 a is also insulated from the column-direction wiring 31 formed in the different layer (the upper electrode 30 ).
- the floating wiring 21 a includes disconnection portions 21 b that divide the floating wiring 21 a.
- the disconnection portions 21 b are formed so as to extend in a longitudinal direction, that is, the column direction.
- FIG. 4 is an enlarged view of the area A in FIG. 3 .
- Each of the disconnection portions 21 c disconnects the floating wiring 21 a from the row-direction wiring 21 .
- each of the disconnection portions 21 b divides and disconnects the floating wiring 21 a in the longitudinal direction, that is, in the column direction.
- the wiring width Wc of the column-direction wiring 31 is smaller than the length in the row direction M 2 of the second portion E 2 of the row-direction wiring 21 , by which the row-direction wiring 21 and the column-direction wiring 31 are separated by the width in the row direction L of the floating wiring 21 a in planar view.
- the upper electrode 30 is made up of the column-direction wiring 31 and disconnection portion wiring 32 .
- the column-direction wiring 31 is formed of mesh-like wiring similar to the row-direction wiring 21 , and extends in the column direction with the wiring width Wc.
- an area where a mesh interval of the column-direction wiring 31 is large is an area where the column-direction wiring 31 overlaps the row-direction wiring 21 in planar view.
- the row-direction wiring 21 described in FIG. 3 and the column-direction wiring 31 described in FIG. 5 intersect around the center of the second portion E 2 of the row-direction wiring 21 ( FIG. 6 ). Furthermore, the wiring width We of the column-direction wiring 31 is smaller than the length in the row direction M 2 of the second portion E 2 of the row-direction wiring 21 . As shown in FIG. 6 , in the intersection portion of the row-direction wiring 21 and the column-direction wiring, the gaps each having the width L in the row direction are formed between the row-direction wiring 21 and the column-direction wiring. In the gaps, the floating wiring 21 a is formed.
- the disconnection portion wiring 32 is formed so as to fill the disconnection portions 21 b, 21 c in FIG. 4 in planar view.
- the provision of the disconnection portion wiring 32 prevents the disconnection portions 21 b, 21 c from being seen by display light passing through the disconnection portions 21 b, 21 c.
- FIG. 6 the vicinity of the area where the row-direction wiring 21 and the column-direction wiring 31 overlap in planar view is shown. In FIG. 6 , for visibility of the figure, the disconnection portion wiring 32 is not shown.
- the mesh interval of each of the row-direction wiring 21 and the column-direction wiring 31 is twice as large as that in the other portions.
- the mesh of the row-direction wiring 21 and a mesh of the column-direction wiring 31 are complimentarily displaced and overlap.
- the intervals at which the meshes are displaced in the row direction and in the column direction are P 1 and P 2 , respectively.
- the mesh interval in the area where the row-direction wiring 21 and the column-direction wiring 31 overlap in planar view is made equal to the mesh interval in the other wiring portions, by which a reflectivity of outside light at the portions where the row-direction wiring 21 and the column-direction wiring 31 intersect is uniformized to suppress the portion from being seen.
- the row-direction wiring 21 is a drive electrode and the column-direction wiring 31 is a reception electrode to detect the inter-wiring capacitance (mutual capacitance) between the row-direction wiring 21 and the column-direction wiring as an electric charge amount.
- a drive pulse voltage is applied to the row-direction wiring 21 as the drive electrode to charge the inter-wiring capacitance between the row-direction wiring 21 and the column-direction wiring 31 , and then, these charged electric charges are detected in an electric charge detection circuit connected to the column-direction wiring 31 .
- a series of operation including this charging and electric charge detection is sequentially performed in each of the row-direction wirings 21 .
- noise that the touch screen receives from a display panel combined with the touch screen in an opposite surface of an indication body operation surface will be considered.
- the electric charges detected from the column-direction wiring 31 include electric charges due to a coupling capacitance between the display panel and the column-direction wiring 31 in addition to the charged electric charges of the inter-wiring capacitance.
- a voltage of a display panel surface, varying with the drive of the display panel, is generally asynchronous with the detection operation of the touch screen.
- the electric charges charged in the coupling capacitance of the display panel and the column-direction wiring 31 become noise to the charged electric charges in the inter-wiring capacitance between the row-direction wiring 21 and the column-direction wiring 31 , which is originally desired to be detected. Therefore, in order to reduce these noise electric charges and enhance a detection S/N ratio, it is effective to reduce the coupling capacitance of the display panel and the row-direction wiring 31 .
- the row-direction wiring 21 included in the lower electrode 20 is made up of the first portion E 1 and the second portion E 2 having the wiring width W 2 smaller than the wiring width W 1 of the first portion E 1 .
- the wiring width Wc of the column-direction wiring 31 included in the upper electrode 30 is smaller than the length in the row direction M 2 of the second portion E 2 of the row-direction wiring 21 .
- the row-direction wiring 21 and the column-direction wiring 31 intersect in the second portion E 2 of the row-direction wiring 21 .
- a width of the conducting wires making up the meshes of the row-direction wiring 21 and the column-direction wiring 31 is 3 ⁇ m, and a disconnection interval of the disconnection portions is 10 ⁇ m.
- a thickness of the transparent substrate 10 is 0.9 mm, and the width in the row-direction L of the floating wiring 21 a is 800 ⁇ m.
- the interval in the row direction P 1 of the mesh and the interval in the column direction P 2 are 200 ⁇ m.
- FIG. 7 shows results from calculating the detection sensitivity by simulation when the width in the row direction of the floating wiring 21 a (hereinafter, referred to as a floating wiring width L) and the thickness of the transparent substrate 10 are varied.
- the detection sensitivity is a ratio between the change amount of the inter-wiring capacitance when the indication body such as a finger touches the transparent substrate 10 , and the inter-wiring capacitance when there is no touch.
- a detection sensitivity relative value in a vertical axis in FIG. 7 is a ratio to the detection sensitivity in the case where the floating wiring width is zero with the thickness of the transparent substrate 10 constant.
- That the floating wiring width L is zero means a case where as shown in FIG. 8 , the row-direction wiring 21 does not include the floating portions 21 a.
- FIG. 9 shows results from examining a relationship between the thickness of the transparent substrate 10 and an optimal floating wiring width when the floating wiring width L that gives the maximum value is the optimal floating wiring width. It is found that the optimal floating wiring width is increased in proportion to the thickness of the transparent substrate 10 .
- the thickness of the transparent substrate 10 is 0.9 mm, and the floating wiring width L is 800 ⁇ m.
- the detection sensitivity is enhanced about twice as much as that in the case where the floating wiring 21 a is not included. It is preferable to decide the floating wiring width L, based on FIG. 9 .
- FIG. 10 shows a relationship between a direction where the disconnection portions 21 b included in the floating wiring 21 a and a number of the disconnection portions 21 b, and the inter-wiring capacitance.
- a relative value of the inter-wiring capacitance in FIG. 10 is a ratio to the inter-wiring capacitance in the case where the disconnection portion 21 b is not provided in the floating wiring 21 a.
- the one disconnection portion 21 b is provided so as to extend in a longitudinal direction of the floating wiring 21 a, that is, in the column direction. From FIG. 10 , it is found that in the present embodiment, the inter-wiring capacitance is reduced about to a half, as compared with the case where the disconnection portion 21 b is not provided in the floating wiring 21 a. Moreover, it is also found that as the number of the disconnection portions 21 b is increased, the inter-wiring capacitance can be reduced more.
- the disconnection portion 21 b is provided so as to extend in a short-length direction of the floating wiring 21 a, that is, in the row direction, the effect of reducing the inter-wiring capacitance is smaller than the case where it is provided so as to extend in the column direction.
- the disconnection portion 21 b is provided so as to extend in the longitudinal direction of the floating wiring 21 a.
- making the row-direction wiring 21 and the column-direction wiring 31 the mesh-like wiring enables the wider detectable area to be covered at a smaller wiring area. Moreover, making the row-direction wiring 21 and the column-direction wiring 31 the mesh-like wiring can reduce a parasitic capacitance of the wiring, and also suppress occurrence of a moire phenomenon.
- a material, a conducting wire width, and the mesh interval of each of the row-direction wiring 21 and the column-direction wiring 31 are not limited to the present embodiment.
- a transparent conductive material such as ITO, graphene and the like, or a metal material such as aluminum, chrome, copper, silver and the like
- a metal material such as aluminum, chrome, copper, silver and the like
- alloys of aluminum, chrome, copper, silver or the like, or a multilayer structure in which nitride aluminum or the like is formed on any of these alloys may be employed.
- the conducting wire width and the mesh interval may be set to different values from those in the present embodiment in accordance with a purpose of the touch screen or the like.
- the number of the disconnection portions 21 b is one, the number can be further increased.
- the floating wiring 21 a may be formed as the upper electrode 30 .
- the floating wiring 21 a is formed in the same layer as the column-direction wiring 31 .
- the intervals can be provided in the row direction in planar view between the row-direction wiring 21 and the column-direction wiring 31 .
- the touch detection with a finger is conducted in a state where a mutual capacitance type detection circuit is attached to each of the touch screen 1 in the present embodiment and the touch screen having the wiring structure shown in FIG. 8 .
- a mutual capacitance type detection circuit is attached to each of the touch screen 1 in the present embodiment and the touch screen having the wiring structure shown in FIG. 8 .
- the touch screen 1 in the present embodiment coordinates of a touch position are detected properly.
- the touch screen having the wiring structure shown in FIG. 8 since the inter-wiring capacitance is large, it exceeds a dynamic range of the detection circuit, so that the coordinates of the touch position cannot be detected properly.
- the touch screen 1 in the present embodiment is the touch screen 1 covered with a mesh-like wiring pattern made up of the upper and lower two layers including the row-direction wiring 21 and the column-direction wiring 31 , wherein the row-direction wiring 21 is made up of the first portion E 1 and the second portion E 2 having the wiring width W 2 smaller than the wiring width of the first portion E 1 , the wiring width Wc of the column-direction wiring 31 is smaller than the length in the row direction M 2 of the second portion E 2 of the row-direction wiring 21 , the row-direction wiring 21 and the column-direction wiring 31 intersect in the second portion E 2 of the row-direction wiring 21 , gaps are formed between the row-direction wiring 21 and the column-direction wiring 31 in planar view in the intersection portion of the row-direction wiring 21 and the column-direction wiring 31 , the touch screen 1 further includes the floating wiring 21 a that fills the relevant gaps in planar view, the floating wiring 21 a is formed in the same layer as the row-direction wiring 21 or the
- the row-direction wiring 21 and the column-direction wiring 31 intersect in the second portion E 2 having the smaller wiring width in the row-direction wiring 21 , and the wiring width Wc of the column-direction wiring 31 is smaller than the length in the row direction M 2 of the second portion E 2 of the row-direction wiring 21 , which allow the gaps to be formed between the row-direction wiring 21 and the column-direction wiring 31 in planar view.
- the inter-wiring capacitance between the row-direction wiring 21 and the column-direction wiring 31 is reduced.
- the wiring width We of the column-direction wiring 31 is made smaller than the length in the row direction M 2 of the second portion E 2 of the row-direction wiring 21 , which makes the wiring width Wc of the column-direction wiring 31 thinner, so that the noise reception area of the column-direction wiring 31 is reduced.
- the change amount of the inter-wiring capacitance when the transparent substrate 10 is touched can be increased.
- the touch detection sensitivity can be enhanced, as compared with the case where the foregoing gaps are not provided.
- the floating wiring 21 a insulated from a periphery thereof is provided in the foregoing gaps, the effect of enhancement in the touch detection sensitivity can be obtained without degrading visibility.
- the floating wiring 21 a includes the disconnection portion 21 b that divides the floating wiring 21 a, and the disconnection portion 21 b is formed so as to extend in the longitudinal direction of the floating wiring 21 a.
- the disconnection portion 21 b is provided in the floating wiring 21 a to divide the floating wiring 21 a , by which the inter-wiring capacitance between the row-direction wiring 21 and the column-direction wiring 31 can be reduced more, so that the touch detection sensitivity can be further enhanced.
- the disconnection portion 21 b is formed so as to extend in the longitudinal direction of the floating wiring 21 a , which can effectively reduce the inter-wiring capacitance.
- the floating wiring 21 a is insulated by being divided from the peripheral wiring, the disconnection portion wiring 32 that fills the divided portion (i.e., the disconnection portion 21 c ) and the disconnection portion 21 b in planar view is further included, and the disconnection portion wiring 32 is formed in the layer where the floating wiring 21 a is not formed.
- the disconnection portion wiring 32 that fills the disconnection portions 21 b , 21 c in planar view uniformizes the reflectivity of the outside light, the disconnection portions 21 b, 21 c can be suppressed from being visually recognized.
- the mesh of the row-direction wiring 21 and the mesh of the column-direction wiring 31 are arranged so as to be complementarily displaced in planar view.
- the floating wiring 21 a insulated from the peripheral wiring is provided in a part of the row-direction wiring 21 , by which the optimal intervals for the touch detection with respect to the thickness of the transparent substrate 10 can be provided between the row-direction wiring 21 and the column direction wiring 31 without degrading the visibility.
- the mesh-like wiring is made by repetition of a unit pattern. Accordingly, since the floating wiring 21 a is made by repetition of the same unit pattern as the row-direction wiring 21 and the column-direction wiring 31 , the area where the floating wiring 21 a is provided can be suppressed from being visually recognized.
- any of the row-direction wiring 21 and the column-direction wiring 31 is provided except for the area where these wirings overlap in planar view.
- row-direction dummy wiring 33 is further arranged in an upper electrode 30 in an upper layer of row-direction wiring 21
- column-direction dummy wiring 22 is further arranged in a lower electrode in a lower layer of column-direction wiring 31 .
- a mesh of the row-direction wiring 21 and a mesh of the row-direction dummy wiring 33 are complementarily displaced and overlap.
- a mesh of the column-direction wiring 31 and a mesh of the column-direction dummy wiring 22 are complementarily displayed and overlap.
- the above-described configuration can lessen a difference in reflectivity of outside light between the row-direction wiring 21 and the column-direction wiring 31 to uniformize the reflectivity.
- FIG. 11 is a plan view of the lower electrode 20 in the vicinity of an area where the row-direction wiring 21 and the column-direction wiring 31 overlap in planar view.
- the lower electrode 20 is made up of the row-direction wiring 21 , floating wiring 21 a , and the row-direction dummy wiring 22 .
- the row-direction dummy wiring 22 is formed in an area where the row-direction dummy wiring 22 overlaps the column-direction wiring 31 in planar view.
- the floating wiring 21 a is similar to that in the first embodiment, and thus, a description thereof will be omitted.
- the mesh interval of the row-direction wiring 21 and the column-direction dummy wiring 22 is twice as large as that of the first embodiment. That is, a column-direction interval P 3 and a row-direction interval P 4 are twice as large as P 1 , P 2 in FIG. 3 , respectively.
- the row-direction wiring 21 , the floating wiring 21 a, the column-direction dummy wiring 22 are mutually disconnected by disconnection portions 21 c.
- FIG. 12 is an enlarged view of an area B in FIG. 11 . Dashed lines in FIG. 11 indicate arrangement of the column-direction wiring 31 .
- conducting wires are formed so as to fill intervals of disconnection portions 33 a described later of the row-direction dummy wiring 33 in planar view.
- FIG. 13 is a plan view of the upper electrode 30 in the vicinity of the area where the row-direction wiring 21 and the column-direction wiring 31 overlap in planar view.
- the upper electrode 30 is made up of the column-direction wiring 31 and the row-direction dummy wiring 33 .
- the row-direction dummy wiring 33 is formed in an area where it overlaps the row-direction wiring 21 and the floating wiring 21 a in planar view.
- the column-direction wiring 31 and the row-direction dummy wiring 33 are disconnected by the disconnection portions 33 a.
- the disconnection portions 33 a are provided at positions corresponding to the disconnection portions 21 b, 21 c of the lower electrode 20 .
- the mesh interval of the column-direction wiring 31 and the row-direction dummy wiring 33 is twice as large as that in the first embodiment. That is, the column-direction interval P 3 and the row-direction interval P 4 are twice as large as P 1 , P 2 in FIG. 5 .
- the column-direction wiring 31 and the row-direction dummy wiring 33 are disconnected by the disconnection portions 33 a.
- FIG. 14 is an enlarged view of an area C in FIG. 13 . Dashed lines in FIG. 13 indicate arrangement of the row-direction wiring 21 .
- conducting wires are formed so as to fill the intervals of the disconnection portions 21 b, 21 c of the row-direction wiring 21 in planar view.
- FIG. 15 shows a plan view of the lower electrode 20 and the upper electrode 30 .
- the row-direction dummy wiring 33 is formed in the upper electrode 30 in the upper layer of the row-direction wiring 21 formed in the lower electrode 20 .
- the column-direction dummy wiring 22 is formed in the lower electrode 20 in the lower layer of the column-direction wiring 31 formed in the upper electrode 30 .
- the disconnection portions 33 a are not shown.
- the mesh of the row-direction wiring 21 and the mesh of the row-direction dummy wiring 33 are arranged so as to be complementarily displaced and overlap.
- the mesh of the column-direction wiring 31 and the mesh of the column-direction dummy wiring 22 are arranged so as to be complementarily displaced and overlap.
- the above-described configuration uniformizes the reflectivity in the area of the row-direction wiring 21 and the area of the column-direction wiring 31 , which can suppress the area of the row-direction wiring 21 and the column-direction wiring 31 from being visually recognized.
- the conducting wires are arranged in the disconnection portions 21 b, 21 c so as to fill the disconnection intervals of the disconnection portions 33 a, and the conducting wires are arranged in the disconnection portions 33 a so as to fill the disconnection intervals of the disconnection portions 21 b, 21 c.
- the above-described configuration can prevent display light from passing the connection portions 21 b, 21 c, 33 a, when the touch screen is attached to a front surface of a display device, which preferably makes it difficult for the disconnection portions 21 b , 21 c, 33 a to be visually recognized.
- a width of the conducting wires making up the meshes of the row-direction wiring 21 and the column-direction wiring 31 is 3 ⁇ m
- the disconnection interval of the disconnection portions 21 b, 21 c, 33 a is 10 ⁇ m.
- a thickness of a transparent substrate 10 is 0.9 mm
- a width in the row direction L of the floating wiring 21 a is 800 ⁇ m.
- the mesh intervals P 3 , P 4 in FIGS. 11 and 13 are 400 ⁇ m
- the mesh intervals P 1 , P 2 in FIG. 15 are 200 ⁇ m.
- the touch screen according to the embodiment, and the touch screen in the first embodiment are manufactured, and a mutual capacitance type detection circuit is attached to each of the touch screens to conduct touch detection with a finger.
- a mutual capacitance type detection circuit is attached to each of the touch screens to conduct touch detection with a finger.
- position coordinates of a touch position can be precisely detected as with the touch screen in the first embodiment.
- the touch screen in the embodiment and the touch screen in the first embodiment are visually observed under an indoor illuminance of 1000 lux, and consequently, in the touch screen in the first embodiment, the lower electrode 20 and the upper electrode 30 are visually observed, while in the touch screen in the present embodiment, they are not visually observed.
- the floating wiring 21 a is formed in the same layer as the row-direction wiring 21
- the touch screen further includes the mesh-like column-direction dummy wiring 22 formed in the same layer as the row-direction wiring 21 in a same area as the column-direction wiring 31 in planar view, and the mesh-like row-direction dummy wiring 33 formed in the same layer as the column-direction wiring 31 in a same area as the row-direction wiring 21 in planar view, and the mesh of the column-direction wiring 31 and the mesh 22 of the column-direction dummy wiring are arranged so as to be complementarily displaced in planar view, and the mesh of the row-direction wiring 21 and the mesh of the row-direction dummy wiring 33 are arranged so as to be complementarily displaced in planar view.
- the row-direction dummy wiring 33 is provided in the upper layer of the row-direction wiring 21 and the floating wiring 21 a
- the column-direction dummy wiring 22 is provided in the lower layer of the column-direction wiring 31
- the meshes of wiring in the upper and lower layers are arranged so as to be complementarily displaced in planar view, which can lessen a difference in reflectivity of the outside light between the row-direction wiring 21 and the column-direction wiring 31 to uniformize the reflectivity.
- the reflectivity of the outside light is uniformized, the row-direction wiring 21 and the column-direction wiring 31 can be suppressed from being visually recognized.
- Configurations of a lower electrode 20 and an upper electrode 30 of a touch screen in the present embodiment are different in that the unit pattern of the wiring in the second embodiment ( FIG. 15 ) is changed into a circular arc shape.
- FIG. 16 shows a unit pattern common to row-direction wiring 21 , column-direction wiring 31 , row-direction dummy wiring 33 , and column-direction dummy wiring 22 in the present embodiment.
- the unit pattern of the wiring in the present embodiment is made up of S-shaped wirings intersecting with each other and circular wiring around an intersection of the S-shaped wirings.
- a radius of a circular arc making the S-shaped wiring is r, and a radius of the circular wiring is R.
- An interval in a row direction P 1 and an interval in a column-direction P 2 of the unit pattern is 200 ⁇ m.
- the radius r of the circular arc is 100 ⁇ m, and the radius R of the circular wiring is 80 ⁇ m.
- FIG. 17 shows a plan view of the lower electrode 20 in the vicinity of an area where the row-direction wiring 21 and the column-direction wiring 31 overlap in planar view.
- the unit pattern of the wiring in FIG. 11 is replaced by the circular arc-shaped unit pattern shown in FIG. 16 .
- Disconnection portions 21 c separate and disconnect respective areas of the row-direction wiring 21 , floating wiring 21 a, and the column-direction dummy wiring 22 . Moreover, the floating wiring 21 a is separated and disconnected in a longitudinal direction, that is, in the column direction by three disconnection portions 21 b. The other configurations are the same as those in FIG. 11 , and thus, descriptions will be omitted. Moreover, FIG. 18 is an enlarged view of an area D in FIG. 17 .
- FIG. 19 shows a plan view of the upper electrode 30 in the vicinity of the area where the row-direction wiring 21 and the column-direction wing 31 overlap in planar view.
- the unit pattern of the mesh-like wiring in FIG. 13 is replaced by the circular arc-shaped unit pattern shown in FIG. 16 .
- the other configurations are the same as those in FIG. 13 , and thus, descriptions thereof will be omitted.
- FIG. 20 is an enlarged view of an area E in FIG. 19 .
- FIG. 21 shows a plan view of the lower electrode 20 and the upper electrode 30 in the vicinity of the area where the row-direction wiring 21 and the column-direction wiring 31 overlap in planar view.
- disconnection portions 33 a are omitted.
- FIG. 21 is a view in which the unit pattern of the wiring in FIG. 15 is replaced by the unit pattern in FIG. 16 . While the number of the disconnection portions 21 b dividing the floating wiring 21 a in the column direction is one in FIG. 15 , the number is three in FIG. 21 .
- the other configurations are the same as those in FIG. 15 , and thus, descriptions will be omitted.
- a width of conducting wires making up the wiring is 3 ⁇ m, and a disconnection width of the disconnection portions 21 b, 21 c, 33 a is 10 ⁇ m.
- the S-shaped wirings of the unit pattern are provided so as to extend in a direction inclined at 45° with respect to the row direction, and in a direction inclined at 45° in the opposite direction with respect to the row direction, they may be provided so as to extend in the row direction and the column direction.
- the touch screen in the present embodiment and the touch screen in the second embodiment are manufactured, and a mutual capacitance type detection circuit is attached to each of the touch screens to conduct touch detection with a finger.
- a mutual capacitance type detection circuit is attached to each of the touch screens to conduct touch detection with a finger.
- position coordinates of a touch position can be precisely detected as with the touch screen in the second embodiment.
- the touch screen in the present embodiment and the touch screen in the second embodiment are visually observed under direct sunshine having an illuminance of 80000 lux, and consequently, in the touch screen in the present embodiment, glittering by reflected light of the wiring is more lessened. This is because the unit pattern of the wiring is circular arc-shaped, thereby allowing the reflected light to be reflected in various directions.
- At least part of the unit pattern of the mesh-like wiring includes the circular arc shaped wiring.
- part of the unit pattern is made the circular arc-shaped wiring, by which outside light can be scattered in various directions, as compared with the case where the unit pattern is linear, thereby suppressing glittering by the reflection of the outside light.
- the mesh-like wiring is made of the unit pattern, and in the unit pattern, all the wiring is formed of the circular arc-shaped wiring.
- shaping all the wiring into circular arcs allows the outside light to be more effectively scattered in various directions, which can further suppress the glittering by the reflection of the outside light.
- the mesh-like wiring is made of the unit pattern, and the unit pattern includes the S-shaped wirings intersecting with each other and the circular wiring around the intersection of the S-shaped wirings.
- the circular wiring more effectively allows the outside light to be scattered in various directions, which can further suppress the glittering by the reflection of the outside light.
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Abstract
Description
- The present invention relates to a touch screen.
- A touch panel is a device that detects touch with a finger or the like to specify position coordinates of a position where the touch panel is touched. The touch panel has attracted attention as excellent user interface means. Various types of touch panels such as a resistance film type, an electrostatic capacitive type and the like have been produced.
- Generally, the tough panel is made up of a touch screen incorporating a touch sensor, and a detection device that specifies position coordinates where the touch panel is touched, based on a signal from the touch screen.
- As one of the electrostatic capacitive type touch panels, there is a projected capacitive type touch panel (e.g., refer to Patent Document 1).
- The projected capacitive type touch panel can detect touch even when a front surface side of the touch screen where the touch sensor is incorporated is covered with a protective plate such as a glass plate having a thickness of about several millimeters.
- This type of touch panel is excellent in robustness, because the protective plate can be arranged in a front surface. Moreover, the detection of touch is enabled when gloves are worn. In addition, since it has no movable portion, it has a long service life.
- The projected capacitive type touch panel generally includes a plurality of row-direction wirings provided so as to extend in a row direction, which configures a first electrode, and a plurality of column-direction wirings provided so as to extend in a column direction, which configures a second electrode. A field change between the row-direction wiring and the column-direction wiring, that is, a change in an inter-wiring capacitance of the row-direction wiring and the column-direction wiring (hereinafter, simply referred to as an inter-wiring capacitance) is detected to thereby specify position coordinates where the touch panel is touched. This detection method is generally called a mutual capacitance detection method (e.g., refer to Patent Document 2).
- Moreover, when the touch screen is attached to a display device, a display area of the display device is covered with the row-direction wiring and the column-direction wiring included in the touch screen. In accordance with the arrangement of the wirings, transmission of display light becomes ununiform, or a reflectivity of outside light becomes ununiform, which may cause a moire phenomenon, or may allow wirings to be visually recognized. In order to provide high-quality pictures to a user, a touch screen of which existence is difficult for the user to feel, such as a touch screen in which wirings are difficult to be visually recognized, is more preferable.
- Patent Document 1: Japanese Patent Application Laid-Open No. 2012-103761
- Patent Document 2: Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 2003-526831
- In the above-described projected capacitive type touch panel, there is a problem that if electric field coupling between the first electrode and the second electrode is large, a change of the inter-wiring capacitance is not likely to be caused when an indication body such as a finger touches the touch panel, so that large detection sensitivity cannot be assured. If the detection sensitivity is made small, misdetection is easily caused.
- The present invention is achieved in order to solve the above-described problems, and an object of the present invention is to provide a touch screen in which an inter-wiring capacitance between row-direction wiring and column-direction wiring is small, and a change of the inter-wiring capacitance when the touch screen is touched by an indication body is large. Moreover, to provide a touch screen in which visibility is enhanced is a secondary object.
- A touch screen according to the present invention is a touch screen covered with a mesh-like wiring pattern including upper and lower two layers including row-direction wiring and column-direction wiring, wherein the row-direction wiring includes a first portion and a second portion having a wiring width smaller than a wiring width of the first portion, a wiring width of the column-direction wiring is smaller than a length in a row direction of the second portion of the row-direction wiring, the row-direction wiring and the column-direction wiring intersect in the second portion of the row-direction wiring, gaps are formed between the row-direction wiring and the column-direction wiring in planar view in an intersection portion of the row-direction wiring and the column-direction wiring, the touch screen further includes floating wiring that fills the gaps in planar view, the floating wiring is formed in the same layer as the row-direction wiring or the column-direction wiring, and the floating wiring is insulated from the row-direction wiring and the column-direction wiring.
- According to the present invention, providing the floating wiring enables the gaps each having a width of the floating wiring to be provided between the row-direction wiring and the column-direction wiring without degrading visibility. Thus, providing the floating wiring can reduce the inter-wiring capacitance between the row-direction wiring and the column-direction wiring. Furthermore, a change amount of the inter-wiring capacitance when the touch screen is touched can be increased. Thus, touch detection sensitivity can be enhanced, as compared with a case where the floating wiring is not provided.
- The objects, characteristics, aspects and advantages of the present invention will be made more apparent by the following detailed description and the accompanying drawings.
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FIG. 1 is a perspective view of a touch screen according to a first embodiment. -
FIG. 2 is a plan view of the touch screen according to the first embodiment. -
FIG. 3 is a plan view of a lower electrode of the touch screen according to the first embodiment. -
FIG. 4 is an enlarged view of an area A inFIG. 3 . -
FIG. 5 is a plan view of an upper electrode of the touch screen according to the first embodiment. -
FIG. 6 is a plan view of the lower electrode and the upper electrode of the touch screen according to the first embodiment. -
FIG. 7 is a view showing a relationship between detection sensitivity and a floating wiring width. -
FIG. 8 is a plan view of a lower electrode and an upper electrode of a touch screen that does not include floating wiring. -
FIG. 9 is a view showing a relationship between an optimal floating wiring width and a thickness of a transparent substrate. -
FIG. 10 is a view showing a relationship between a disconnection portion of floating wiring and a relative value of an inter-wiring capacitance. -
FIG. 11 is a plan view of a lower electrode of a touch screen according to a second embodiment. -
FIG. 12 is an enlarged view of an area B inFIG. 11 . -
FIG. 13 is a plan view of an upper electrode of the touch screen according to the second embodiment. -
FIG. 14 is an enlarged view of an area C inFIG. 13 . -
FIG. 15 is a plan view of the lower electrode and the upper electrode of the touch screen according to the second embodiment. -
FIG. 16 is a view showing a unit pattern of wiring in a touch screen according to a third embodiment. -
FIG. 17 is a plan view of a lower electrode of the touch screen according to the third embodiment. -
FIG. 18 is an enlarged view of an area D inFIG. 17 . -
FIG. 19 is a plan view of an upper electrode of the touch screen according to the third embodiment. -
FIG. 20 is an enlarged view of an area E inFIG. 19 . -
FIG. 21 is a plan view of the lower electrode and the upper electrode of the touch screen according to the third embodiment. - First, referring to
FIGS. 1 and 2 , a layer structure of atouch screen 1 of the present embodiment will be described. Thetouch screen 1 in the present embodiment is a projected capacitive type touch screen. -
FIG. 1 is a perspective view of the layer structure of thetouch screen 1 of the present embodiment. An upper surface layer of thetouch screen 1 is atransparent substrate 10 made of a transparent glass material or transparent resin. On a back surface of thetransparent substrate 10, anupper electrode 30 is formed. - Moreover, in the back surface of the
transparent substrate 10, aninterlayer insulation film 11 is formed so as to cover theupper electrode 30. Theinterlayer insulation film 11 is a transparent insulation film such as a silicon nitride film, a silicon oxide film and the like. On a back surface of theinterlayer insulation film 11, alower electrode 20 is formed. - Moreover, in the back surface of the
interlayer insulation film 11, aprotective film 12 is formed so as to cover thelower electrode 20. Theprotective film 12 is an insulating film having translucency such as a silicon nitride film and the like, similar to theinterlayer insulation film 11. - The
upper electrode 30 includes a plurality of column-direction wirings 31 made of a transparent wiring material such as ITO (Indium Tin Oxide) and the like, or a metal wiring material such as aluminum and the like. Moreover, thelower electrode 20 includes a plurality of row-direction wirings 21 made of the same material as the column-direction wirings 31. - In
FIGS. 1 and 2 , for convenience of illustration, the column-direction wiring 31 and the row-direction wiring 21 are not shown so as to have a mesh-like structure as described later. - In the present embodiment, the column-
direction wiring 31 and the row-direction wiring 21 each have a multilayer structure of an aluminum-based alloy layer and a nitride layer thereof. This can make a wiring resistance small and increase a transmittance of light in a detectable area. - Moreover, while the column-
direction wiring 31 is arranged in an upper layer of the row-direction wiring 21, a positional relation thereof may be reversed, so that the row-direction wiring 21 is arranged in an upper layer of the column-direction wiring 31. - A user performs operation by touching the
transparent substrate 10, which is a surface of thetouch screen 1, with an indication body such as a finger and the like. When the indication body touches thetransparent substrate 10, an inter-wiring capacitance between the row-direction wiring 21 and the column-direction wiring 31 under thetransparent substrate 10 is changed. This capacitance change is detected, by which it can be specified at which position inside the detectable area thetransparent substrate 10 is touched. -
FIG. 2 is a plan view of thetouch screen 1 of the present embodiment. The detectable area of thetouch screen 1 is made up of the plurality of row-direction wirings 21 extending in a lateral direction (row direction), and the plurality of column-direction wirings 31 overlapping in planar view on a front side of the row-direction wirings 21 and extending in a longitudinal direction (column direction). - The respective row-
direction wirings 21 are connected to aterminal 8 to be connected to outside wiring by lead lines R1 to R6. Moreover, the respective column-direction wirings 31 are similarly connected to theterminal 8 to be connected to the outside wiring by lead lines C1 to C8. - The lead lines R4, R5 are arranged along an outer circumference of the detectable area. Moreover, the lead lines R3, R6 are arranged along the outer circumference of the detectable area, and after reaching the lead line R4 or the lead line R5, they are arranged along the lead lines R4, R5. In this manner, the lead lines RI to R6 are arranged close to an outer circumferential side of the detectable area. The lead lines C1 to C8 are also arranged close to the outer circumferential side of the detectable area in order from the lead line closest to the
terminal 8. - Arranging the lead lines R1 to R6, C1 to C8 as close as possible to the outer circumferential side of the detectable area can suppress a fringe capacitance between the display device to which the
touch screen 1 is attached, and lead wiring. Thus, the above-described arrangement of the lead wiring can reduce influence on the lead wiring by electromagnetic noise caused from the display device to which thetouch screen 1 is attached. - Moreover, in a portion where the lead line C8 of the column-
direction wiring 31 and the lead line R6 of the row-direction wiring 21 extend in parallel, dummy lead wiring 40 to which a reference potential of ground or the like is supplied is provided between the lead wirings. - Providing the dummy lead wiring 40 in this manner can largely reduce the inter-wiring capacitance between the lead line C8 and the lead line R6, and thus, even when the indication body such as a finger touches this portion, misdetection can be prevented.
- Next, referring to
FIGS. 3 to 6 , detailed structures of the row-direction wiring 21 and the column-direction wiring 31 will be described.FIG. 3 is a plan view of thelower electrode 20 in which a vicinity of an area where the row-direction wiring 21 and the column-direction wiring 31 overlap in planar view is enlarged.FIG. 4 is an enlarged view of an area A inFIG. 3 . Moreover,FIG. 5 is a plan view of theupper electrode 30 in which a vicinity of the area where the row-direction wiring 21 and the column-direction wiring 31 overlap in planar view is enlarged. Moreover,FIG. 6 is a plan view of the area where the row-direction wiring 21 and the column-direction wiring 31 overlap in planar view. InFIGS. 3 to 6 , a lateral direction is the row direction, and a longitudinal direction is the column direction.FIGS. 3 to 6 schematically show a wiring pattern, and thicknesses and intervals of the wirings are different from an actual situation. - As shown in
FIG. 3 , the row-direction wiring 21 included in thelower electrode 20 is formed of mesh-like wiring. The mesh-like wiring is made by repetition of conducting wires extending in a direction inclined at 45° with respect to the row direction, and conducting wires extending in a direction inclined at 45° in an opposite direction with respect to the row direction. - In
FIG. 3 , blank areas extending in the column direction from a central portion of the row-direction wiring 21 are areas where the column-direction wiring 31 is arranged in planar view. Moreover, in the central portion inFIG. 3 , an area where an interval of a mesh of the row-direction wiring 21 is larger is an area where the row-direction wiring 21 overlaps the column-direction wiring 31 in planar view. - In the present embodiment, the row-
direction wiring 21 has a narrow width in an intersection portion with the column-direction wiring 31. As shown inFIG. 3 , the row-direction wiring 21 is made up of a first portion E1 and a second portion E2. A wiring width W2 of the second portion E2 is smaller than a wiring width W1 of the first portion. Moreover, a wiring width We of the column-direction wiring 31 shown inFIG. 5 is smaller than a length in the row direction M2 of the second portion E2 of the row-direction wiring 21. As shown inFIG. 6 , the row-direction wiring 21 and the column-direction wiring 31 intersect around a center of the second portion E2 of the row-direction wiring 21. That is, gaps each having a width L in the row direction in planar view are provided between the row-direction wiring 21 and the column-direction wiring 31 in the intersection portion of the row-direction wiring 21 and the column-direction wiring 31. Thelower electrode 20 further includes floatingwiring 21 a so as to fill these gaps in planar view. - The floating
wiring 21 a is formed of mesh-like wiring similar to the row-direction wiring 21. The floatingwiring 21 a is divided and insulated bydisconnection portions 21 c from the row-direction wiring 21 formed in the same layer. Moreover, the floatingwiring 21 a is also insulated from the column-direction wiring 31 formed in the different layer (the upper electrode 30). - The floating
wiring 21 a includesdisconnection portions 21 b that divide the floatingwiring 21 a. Thedisconnection portions 21 b are formed so as to extend in a longitudinal direction, that is, the column direction. -
FIG. 4 is an enlarged view of the area A inFIG. 3 . Each of thedisconnection portions 21 c disconnects the floatingwiring 21 a from the row-direction wiring 21. Moreover, each of thedisconnection portions 21 b divides and disconnects the floatingwiring 21 a in the longitudinal direction, that is, in the column direction. - In this manner, in the intersection portion of the row-
direction wiring 21 and the column-direction wiring 31, the wiring width Wc of the column-direction wiring 31 is smaller than the length in the row direction M2 of the second portion E2 of the row-direction wiring 21, by which the row-direction wiring 21 and the column-direction wiring 31 are separated by the width in the row direction L of the floatingwiring 21 a in planar view. - As shown in
FIG. 5 , theupper electrode 30 is made up of the column-direction wiring 31 anddisconnection portion wiring 32. The column-direction wiring 31 is formed of mesh-like wiring similar to the row-direction wiring 21, and extends in the column direction with the wiring width Wc. InFIG. 5 , an area where a mesh interval of the column-direction wiring 31 is large is an area where the column-direction wiring 31 overlaps the row-direction wiring 21 in planar view. - The row-
direction wiring 21 described inFIG. 3 and the column-direction wiring 31 described inFIG. 5 intersect around the center of the second portion E2 of the row-direction wiring 21 (FIG. 6 ). Furthermore, the wiring width We of the column-direction wiring 31 is smaller than the length in the row direction M2 of the second portion E2 of the row-direction wiring 21. As shown inFIG. 6 , in the intersection portion of the row-direction wiring 21 and the column-direction wiring, the gaps each having the width L in the row direction are formed between the row-direction wiring 21 and the column-direction wiring. In the gaps, the floatingwiring 21 a is formed. - Moreover, in
FIG. 5 , thedisconnection portion wiring 32 is formed so as to fill thedisconnection portions FIG. 4 in planar view. The provision of thedisconnection portion wiring 32 prevents thedisconnection portions disconnection portions - In
FIG. 6 , the vicinity of the area where the row-direction wiring 21 and the column-direction wiring 31 overlap in planar view is shown. InFIG. 6 , for visibility of the figure, thedisconnection portion wiring 32 is not shown. - In the area where the row-
direction wiring 21 and the column-direction wiring 31 overlap in planar view, the mesh interval of each of the row-direction wiring 21 and the column-direction wiring 31 is twice as large as that in the other portions. In the portion where the row-direction wiring 21 and the column-direction wiring 31 overlap in planar view, the mesh of the row-direction wiring 21 and a mesh of the column-direction wiring 31 are complimentarily displaced and overlap. The intervals at which the meshes are displaced in the row direction and in the column direction are P1 and P2, respectively. - In this manner, the mesh interval in the area where the row-
direction wiring 21 and the column-direction wiring 31 overlap in planar view is made equal to the mesh interval in the other wiring portions, by which a reflectivity of outside light at the portions where the row-direction wiring 21 and the column-direction wiring 31 intersect is uniformized to suppress the portion from being seen. - Here, when a mutual capacitance detection method is applied to the touch screen in the present embodiment, for example, the row-
direction wiring 21 is a drive electrode and the column-direction wiring 31 is a reception electrode to detect the inter-wiring capacitance (mutual capacitance) between the row-direction wiring 21 and the column-direction wiring as an electric charge amount. - At this time, in a state where the column-
direction wiring 31 as the reception (detection) electrode is set to a constant potential, a drive pulse voltage is applied to the row-direction wiring 21 as the drive electrode to charge the inter-wiring capacitance between the row-direction wiring 21 and the column-direction wiring 31, and then, these charged electric charges are detected in an electric charge detection circuit connected to the column-direction wiring 31. A series of operation including this charging and electric charge detection is sequentially performed in each of the row-direction wirings 21. - Here, noise that the touch screen receives from a display panel combined with the touch screen in an opposite surface of an indication body operation surface will be considered.
- The electric charges detected from the column-
direction wiring 31 include electric charges due to a coupling capacitance between the display panel and the column-direction wiring 31 in addition to the charged electric charges of the inter-wiring capacitance. A voltage of a display panel surface, varying with the drive of the display panel, is generally asynchronous with the detection operation of the touch screen. Thus, the electric charges charged in the coupling capacitance of the display panel and the column-direction wiring 31 become noise to the charged electric charges in the inter-wiring capacitance between the row-direction wiring 21 and the column-direction wiring 31, which is originally desired to be detected. Therefore, in order to reduce these noise electric charges and enhance a detection S/N ratio, it is effective to reduce the coupling capacitance of the display panel and the row-direction wiring 31. - However, as shown in
FIG. 1 , when theupper electrode 30 and thelower electrode 20 are provided on one side of thetransparent substrate 10 with theinterlayer insulation film 11 interposed, it is difficult in manufacturing to make a thickness of theinterlayer insulation film 11 larger than about several μm. Accordingly, in order to keep the inter-wiring capacitance between the row-direction wiring 21 and the column-direction wiring 31 small, an area of the intersection portion between the row-direction wiring 21 and the column-direction wiring 31 (the portion where both the wirings overlap in planar view) needs to be small. - This disables the whole column-
direction wiring 31 included in theupper electrode 30 to be covered with the row-direction wiring 21 included in thelower electrode 20, so that a portion where the column-direction wiring 31 is exposed to the display panel becomes large. Accordingly, in order to suppress the coupling capacitance of the display panel and the column-direction wiring 31 and enhance the detection S/N ratio, an exposure area of the column-direction wiring 31 to the display panel (a noise reception area from the display panel) only needs to be reduced. This can be realized, for example, by making the wiring width We of the row-direction wiring 31 smaller. - In the touch screen in the present embodiment, the row-
direction wiring 21 included in thelower electrode 20 is made up of the first portion E1 and the second portion E2 having the wiring width W2 smaller than the wiring width W1 of the first portion E1. Moreover, the wiring width Wc of the column-direction wiring 31 included in theupper electrode 30 is smaller than the length in the row direction M2 of the second portion E2 of the row-direction wiring 21. The row-direction wiring 21 and the column-direction wiring 31 intersect in the second portion E2 of the row-direction wiring 21. - This reduces the inter-wiring capacitance between the row-
direction wiring 21 and the column-direction wiring 31, and a change amount of the inter-wiring capacitance when thetransparent substrate 10 is touched is increased, thereby enhancing touch detection sensitivity, and further, the wiring width Wc of the row-direction wiring 31 is made smaller to reduce the noise reception area, which can suppress influence by noise caused from the display panel. - In the present embodiment, a width of the conducting wires making up the meshes of the row-
direction wiring 21 and the column-direction wiring 31 is 3 μm, and a disconnection interval of the disconnection portions is 10 μm. In the present embodiment, a thickness of thetransparent substrate 10 is 0.9 mm, and the width in the row-direction L of the floatingwiring 21 a is 800 μm. Moreover, the interval in the row direction P1 of the mesh and the interval in the column direction P2 are 200 μm. - Effects of enhancement in detection sensitivity by providing the floating
wiring 21 a will be described.FIG. 7 shows results from calculating the detection sensitivity by simulation when the width in the row direction of the floatingwiring 21 a (hereinafter, referred to as a floating wiring width L) and the thickness of thetransparent substrate 10 are varied. - The detection sensitivity is a ratio between the change amount of the inter-wiring capacitance when the indication body such as a finger touches the
transparent substrate 10, and the inter-wiring capacitance when there is no touch. - A detection sensitivity relative value in a vertical axis in
FIG. 7 is a ratio to the detection sensitivity in the case where the floating wiring width is zero with the thickness of thetransparent substrate 10 constant. - That the floating wiring width L is zero means a case where as shown in
FIG. 8 , the row-direction wiring 21 does not include the floatingportions 21 a. - From
FIG. 7 , it is found that when the thickness of thetransparent substrate 10 is constant, the detection sensitivity relative value becomes maximum at a certain value of the floating wiring width L. It is also that the floating wiring width L that gives a maximum value differs, depending on the thickness of thetransparent substrate 10. -
FIG. 9 shows results from examining a relationship between the thickness of thetransparent substrate 10 and an optimal floating wiring width when the floating wiring width L that gives the maximum value is the optimal floating wiring width. It is found that the optimal floating wiring width is increased in proportion to the thickness of thetransparent substrate 10. - In the present embodiment, the thickness of the
transparent substrate 10 is 0.9 mm, and the floating wiring width L is 800 μm. Thus, fromFIG. 7 , it is found that as to thetouch screen 1 in the present embodiment, the detection sensitivity is enhanced about twice as much as that in the case where the floatingwiring 21 a is not included. It is preferable to decide the floating wiring width L, based onFIG. 9 . -
FIG. 10 shows a relationship between a direction where thedisconnection portions 21 b included in the floatingwiring 21 a and a number of thedisconnection portions 21 b, and the inter-wiring capacitance. A relative value of the inter-wiring capacitance inFIG. 10 is a ratio to the inter-wiring capacitance in the case where thedisconnection portion 21 b is not provided in the floatingwiring 21 a. - In the present embodiment, the one
disconnection portion 21 b is provided so as to extend in a longitudinal direction of the floatingwiring 21 a, that is, in the column direction. FromFIG. 10 , it is found that in the present embodiment, the inter-wiring capacitance is reduced about to a half, as compared with the case where thedisconnection portion 21 b is not provided in the floatingwiring 21 a. Moreover, it is also found that as the number of thedisconnection portions 21 b is increased, the inter-wiring capacitance can be reduced more. - Moreover, from
FIG. 10 , it is found that when thedisconnection portion 21 b is provided so as to extend in a short-length direction of the floatingwiring 21 a, that is, in the row direction, the effect of reducing the inter-wiring capacitance is smaller than the case where it is provided so as to extend in the column direction. Thus, it is preferable that thedisconnection portion 21 b is provided so as to extend in the longitudinal direction of the floatingwiring 21 a. - As in the present embodiment, making the row-
direction wiring 21 and the column-direction wiring 31 the mesh-like wiring enables the wider detectable area to be covered at a smaller wiring area. Moreover, making the row-direction wiring 21 and the column-direction wiring 31 the mesh-like wiring can reduce a parasitic capacitance of the wiring, and also suppress occurrence of a moire phenomenon. - However, a material, a conducting wire width, and the mesh interval of each of the row-
direction wiring 21 and the column-direction wiring 31 are not limited to the present embodiment. - As the material of the row-
direction wiring 21 and the column-direction wiring 31, a transparent conductive material such as ITO, graphene and the like, or a metal material such as aluminum, chrome, copper, silver and the like can be used. Moreover, alloys of aluminum, chrome, copper, silver or the like, or a multilayer structure in which nitride aluminum or the like is formed on any of these alloys may be employed. Moreover, the conducting wire width and the mesh interval may be set to different values from those in the present embodiment in accordance with a purpose of the touch screen or the like. - While in the present embodiment, the number of the
disconnection portions 21 b is one, the number can be further increased. - Moreover, while in the present embodiment, the configuration in which the floating
wiring 21 a is formed as thelower electrode 20, that is, the configuration in which the floatingwiring 21 a is formed in the same layer as the row-direction wiring 21 is employed, the floatingwiring 21 a may be formed as theupper electrode 30. In this case, the floatingwiring 21 a is formed in the same layer as the column-direction wiring 31. Even when the above-described configuration is employed, the intervals can be provided in the row direction in planar view between the row-direction wiring 21 and the column-direction wiring 31. - In order to confirm the effects of the present invention, the touch detection with a finger is conducted in a state where a mutual capacitance type detection circuit is attached to each of the
touch screen 1 in the present embodiment and the touch screen having the wiring structure shown inFIG. 8 . In thetouch screen 1 in the present embodiment, coordinates of a touch position are detected properly. On the other hand, as for the touch screen having the wiring structure shown inFIG. 8 , since the inter-wiring capacitance is large, it exceeds a dynamic range of the detection circuit, so that the coordinates of the touch position cannot be detected properly. - The
touch screen 1 in the present embodiment is thetouch screen 1 covered with a mesh-like wiring pattern made up of the upper and lower two layers including the row-direction wiring 21 and the column-direction wiring 31, wherein the row-direction wiring 21 is made up of the first portion E1 and the second portion E2 having the wiring width W2 smaller than the wiring width of the first portion E1, the wiring width Wc of the column-direction wiring 31 is smaller than the length in the row direction M2 of the second portion E2 of the row-direction wiring 21, the row-direction wiring 21 and the column-direction wiring 31 intersect in the second portion E2 of the row-direction wiring 21, gaps are formed between the row-direction wiring 21 and the column-direction wiring 31 in planar view in the intersection portion of the row-direction wiring 21 and the column-direction wiring 31, thetouch screen 1 further includes the floatingwiring 21 a that fills the relevant gaps in planar view, the floatingwiring 21 a is formed in the same layer as the row-direction wiring 21 or the column-direction wiring 31, and the floatingwiring 21 a is insulated from the row-direction wiring 21 and the column-direction wiring 31. - Accordingly, the row-
direction wiring 21 and the column-direction wiring 31 intersect in the second portion E2 having the smaller wiring width in the row-direction wiring 21, and the wiring width Wc of the column-direction wiring 31 is smaller than the length in the row direction M2 of the second portion E2 of the row-direction wiring 21, which allow the gaps to be formed between the row-direction wiring 21 and the column-direction wiring 31 in planar view. Thus, the inter-wiring capacitance between the row-direction wiring 21 and the column-direction wiring 31 is reduced. Moreover, the wiring width We of the column-direction wiring 31 is made smaller than the length in the row direction M2 of the second portion E2 of the row-direction wiring 21, which makes the wiring width Wc of the column-direction wiring 31 thinner, so that the noise reception area of the column-direction wiring 31 is reduced. Thus, the change amount of the inter-wiring capacitance when thetransparent substrate 10 is touched can be increased. As described above, the touch detection sensitivity can be enhanced, as compared with the case where the foregoing gaps are not provided. Furthermore, in the present embodiment, since the floatingwiring 21 a insulated from a periphery thereof is provided in the foregoing gaps, the effect of enhancement in the touch detection sensitivity can be obtained without degrading visibility. - Moreover, in the
touch screen 1 in the present embodiment, the floatingwiring 21 a includes thedisconnection portion 21 b that divides the floatingwiring 21 a, and thedisconnection portion 21 b is formed so as to extend in the longitudinal direction of the floatingwiring 21 a. - Accordingly, the
disconnection portion 21 b is provided in the floatingwiring 21 a to divide the floatingwiring 21 a, by which the inter-wiring capacitance between the row-direction wiring 21 and the column-direction wiring 31 can be reduced more, so that the touch detection sensitivity can be further enhanced. Particularly, thedisconnection portion 21 b is formed so as to extend in the longitudinal direction of the floatingwiring 21 a, which can effectively reduce the inter-wiring capacitance. - Moreover, in the
touch screen 1 in the present embodiment, the floatingwiring 21 a is insulated by being divided from the peripheral wiring, thedisconnection portion wiring 32 that fills the divided portion (i.e., thedisconnection portion 21 c) and thedisconnection portion 21 b in planar view is further included, and thedisconnection portion wiring 32 is formed in the layer where the floatingwiring 21 a is not formed. - Accordingly, since providing the
disconnection portion wiring 32 that fills thedisconnection portions disconnection portions - Moreover, in the
touch screen 1 in the present embodiment, the mesh of the row-direction wiring 21 and the mesh of the column-direction wiring 31 are arranged so as to be complementarily displaced in planar view. - Accordingly, since in the area where the row-
direction wiring 21 and the column-direction wiring 31 overlap in planar view, arranging the mesh of the row-direction wiring 21 and the mesh of the column-direction wiring 31 so as to be complementarily displaced in planar view uniformizes the reflectivity of the outside light, the intersection portion of the row-direction wiring 21 and the column-direction wiring 31 can be suppressed from being visually recognized. - Moreover, according to the
touch screen 1 in the present embodiment, the floatingwiring 21 a insulated from the peripheral wiring is provided in a part of the row-direction wiring 21, by which the optimal intervals for the touch detection with respect to the thickness of thetransparent substrate 10 can be provided between the row-direction wiring 21 and thecolumn direction wiring 31 without degrading the visibility. - Moreover, in the
touch screen 1 in the present embodiment, the mesh-like wiring is made by repetition of a unit pattern. Accordingly, since the floatingwiring 21 a is made by repetition of the same unit pattern as the row-direction wiring 21 and the column-direction wiring 31, the area where the floatingwiring 21 a is provided can be suppressed from being visually recognized. - In the first embodiment, in the area where the row-
direction wiring 21 or the column-direction wiring 31 is formed, any of the row-direction wiring 21 and the column-direction wiring 31 is provided except for the area where these wirings overlap in planar view. - Thus, since a depth of the layer where the wiring is formed is different between the row-
direction wiring 21 and the column-direction wiring 31, the reflectivity is different between the row-direction wiring 21 and the column-direction wiring 31, so that the wiring is easily visually recognized. - In the present embodiment, row-
direction dummy wiring 33 is further arranged in anupper electrode 30 in an upper layer of row-direction wiring 21, and column-direction dummy wiring 22 is further arranged in a lower electrode in a lower layer of column-direction wiring 31. - Furthermore, in a touch screen in the present embodiment, a mesh of the row-
direction wiring 21 and a mesh of the row-direction dummy wiring 33 are complementarily displaced and overlap. Moreover, in the touch screen in the present embodiment, a mesh of the column-direction wiring 31 and a mesh of the column-direction dummy wiring 22 are complementarily displayed and overlap. - The above-described configuration can lessen a difference in reflectivity of outside light between the row-
direction wiring 21 and the column-direction wiring 31 to uniformize the reflectivity. - Referring to
FIGS. 11 to 15 , a detailed structure of the row-direction wiring 21 and the column-direction wiring 31 of the touch screen in the present embodiment will be described. -
FIG. 11 is a plan view of thelower electrode 20 in the vicinity of an area where the row-direction wiring 21 and the column-direction wiring 31 overlap in planar view. Thelower electrode 20 is made up of the row-direction wiring 21, floatingwiring 21 a, and the row-direction dummy wiring 22. The row-direction dummy wiring 22 is formed in an area where the row-direction dummy wiring 22 overlaps the column-direction wiring 31 in planar view. The floatingwiring 21 a is similar to that in the first embodiment, and thus, a description thereof will be omitted. - The mesh interval of the row-
direction wiring 21 and the column-direction dummy wiring 22 is twice as large as that of the first embodiment. That is, a column-direction interval P3 and a row-direction interval P4 are twice as large as P1, P2 inFIG. 3 , respectively. The row-direction wiring 21, the floatingwiring 21 a, the column-direction dummy wiring 22 are mutually disconnected bydisconnection portions 21 c. -
FIG. 12 is an enlarged view of an area B inFIG. 11 . Dashed lines inFIG. 11 indicate arrangement of the column-direction wiring 31. InFIG. 12 , inrespective disconnection portions disconnection portions 33 a described later of the row-direction dummy wiring 33 in planar view. -
FIG. 13 is a plan view of theupper electrode 30 in the vicinity of the area where the row-direction wiring 21 and the column-direction wiring 31 overlap in planar view. Theupper electrode 30 is made up of the column-direction wiring 31 and the row-direction dummy wiring 33. - The row-
direction dummy wiring 33 is formed in an area where it overlaps the row-direction wiring 21 and the floatingwiring 21 a in planar view. The column-direction wiring 31 and the row-direction dummy wiring 33 are disconnected by thedisconnection portions 33 a. Moreover, in the row-direction dummy wiring 33, thedisconnection portions 33 a are provided at positions corresponding to thedisconnection portions lower electrode 20. - The mesh interval of the column-
direction wiring 31 and the row-direction dummy wiring 33 is twice as large as that in the first embodiment. That is, the column-direction interval P3 and the row-direction interval P4 are twice as large as P1, P2 inFIG. 5 . The column-direction wiring 31 and the row-direction dummy wiring 33 are disconnected by thedisconnection portions 33 a. -
FIG. 14 is an enlarged view of an area C inFIG. 13 . Dashed lines inFIG. 13 indicate arrangement of the row-direction wiring 21. InFIG. 13 , in therespective disconnection portions 33 a, conducting wires are formed so as to fill the intervals of thedisconnection portions direction wiring 21 in planar view. -
FIG. 15 shows a plan view of thelower electrode 20 and theupper electrode 30. As shown inFIG. 15 , the row-direction dummy wiring 33 is formed in theupper electrode 30 in the upper layer of the row-direction wiring 21 formed in thelower electrode 20. Moreover, the column-direction dummy wiring 22 is formed in thelower electrode 20 in the lower layer of the column-direction wiring 31 formed in theupper electrode 30. InFIG. 15 , for visibility of the figure, thedisconnection portions 33 a are not shown. - Moreover, the mesh of the row-
direction wiring 21 and the mesh of the row-direction dummy wiring 33 are arranged so as to be complementarily displaced and overlap. Similarly, the mesh of the column-direction wiring 31 and the mesh of the column-direction dummy wiring 22 are arranged so as to be complementarily displaced and overlap. - The above-described configuration uniformizes the reflectivity in the area of the row-
direction wiring 21 and the area of the column-direction wiring 31, which can suppress the area of the row-direction wiring 21 and the column-direction wiring 31 from being visually recognized. - In the present embodiment, as shown in
FIGS. 12 and 14 , the conducting wires are arranged in thedisconnection portions disconnection portions 33 a, and the conducting wires are arranged in thedisconnection portions 33 a so as to fill the disconnection intervals of thedisconnection portions - The above-described configuration can prevent display light from passing the
connection portions disconnection portions - In the present embodiment, as in the first embodiment, a width of the conducting wires making up the meshes of the row-
direction wiring 21 and the column-direction wiring 31 is 3 μm, and the disconnection interval of thedisconnection portions transparent substrate 10 is 0.9 mm, a width in the row direction L of the floatingwiring 21 a is 800 μm. The mesh intervals P3, P4 inFIGS. 11 and 13 are 400 μm, and the mesh intervals P1, P2 inFIG. 15 are 200 μm. - In order to confirm the effect of the present invention, the touch screen according to the embodiment, and the touch screen in the first embodiment are manufactured, and a mutual capacitance type detection circuit is attached to each of the touch screens to conduct touch detection with a finger. In the touch screen in the present embodiment as well, position coordinates of a touch position can be precisely detected as with the touch screen in the first embodiment.
- Moreover, in order to confirm visibility, in the touch screen in the embodiment and the touch screen in the first embodiment are visually observed under an indoor illuminance of 1000 lux, and consequently, in the touch screen in the first embodiment, the
lower electrode 20 and theupper electrode 30 are visually observed, while in the touch screen in the present embodiment, they are not visually observed. - In the touch screen in the present embodiment, the floating
wiring 21 a is formed in the same layer as the row-direction wiring 21, the touch screen further includes the mesh-like column-direction dummy wiring 22 formed in the same layer as the row-direction wiring 21 in a same area as the column-direction wiring 31 in planar view, and the mesh-like row-direction dummy wiring 33 formed in the same layer as the column-direction wiring 31 in a same area as the row-direction wiring 21 in planar view, and the mesh of the column-direction wiring 31 and themesh 22 of the column-direction dummy wiring are arranged so as to be complementarily displaced in planar view, and the mesh of the row-direction wiring 21 and the mesh of the row-direction dummy wiring 33 are arranged so as to be complementarily displaced in planar view. - Accordingly, the row-
direction dummy wiring 33 is provided in the upper layer of the row-direction wiring 21 and the floatingwiring 21 a, the column-direction dummy wiring 22 is provided in the lower layer of the column-direction wiring 31, and the meshes of wiring in the upper and lower layers are arranged so as to be complementarily displaced in planar view, which can lessen a difference in reflectivity of the outside light between the row-direction wiring 21 and the column-direction wiring 31 to uniformize the reflectivity. - Thus, since in addition to the effects described in the first embodiment, the reflectivity of the outside light is uniformized, the row-
direction wiring 21 and the column-direction wiring 31 can be suppressed from being visually recognized. - Configurations of a
lower electrode 20 and anupper electrode 30 of a touch screen in the present embodiment are different in that the unit pattern of the wiring in the second embodiment (FIG. 15 ) is changed into a circular arc shape. -
FIG. 16 shows a unit pattern common to row-direction wiring 21, column-direction wiring 31, row-direction dummy wiring 33, and column-direction dummy wiring 22 in the present embodiment. - The unit pattern of the wiring in the present embodiment is made up of S-shaped wirings intersecting with each other and circular wiring around an intersection of the S-shaped wirings. A radius of a circular arc making the S-shaped wiring is r, and a radius of the circular wiring is R.
- An interval in a row direction P1 and an interval in a column-direction P2 of the unit pattern is 200 μm. Moreover, the radius r of the circular arc is 100 μm, and the radius R of the circular wiring is 80 μm.
-
FIG. 17 shows a plan view of thelower electrode 20 in the vicinity of an area where the row-direction wiring 21 and the column-direction wiring 31 overlap in planar view. InFIG. 17 , the unit pattern of the wiring inFIG. 11 is replaced by the circular arc-shaped unit pattern shown inFIG. 16 . -
Disconnection portions 21 c separate and disconnect respective areas of the row-direction wiring 21, floatingwiring 21 a, and the column-direction dummy wiring 22. Moreover, the floatingwiring 21 a is separated and disconnected in a longitudinal direction, that is, in the column direction by threedisconnection portions 21 b. The other configurations are the same as those inFIG. 11 , and thus, descriptions will be omitted. Moreover,FIG. 18 is an enlarged view of an area D inFIG. 17 . -
FIG. 19 shows a plan view of theupper electrode 30 in the vicinity of the area where the row-direction wiring 21 and the column-direction wing 31 overlap in planar view. InFIG. 19 , the unit pattern of the mesh-like wiring inFIG. 13 is replaced by the circular arc-shaped unit pattern shown inFIG. 16 . The other configurations are the same as those inFIG. 13 , and thus, descriptions thereof will be omitted. Moreover,FIG. 20 is an enlarged view of an area E inFIG. 19 . -
FIG. 21 shows a plan view of thelower electrode 20 and theupper electrode 30 in the vicinity of the area where the row-direction wiring 21 and the column-direction wiring 31 overlap in planar view. InFIG. 21 , for visibility of the figure,disconnection portions 33 a are omitted.FIG. 21 is a view in which the unit pattern of the wiring inFIG. 15 is replaced by the unit pattern inFIG. 16 . While the number of thedisconnection portions 21 b dividing the floatingwiring 21 a in the column direction is one inFIG. 15 , the number is three inFIG. 21 . The other configurations are the same as those inFIG. 15 , and thus, descriptions will be omitted. - In the present embodiment, a width of conducting wires making up the wiring is 3 μm, and a disconnection width of the
disconnection portions - While in the present embodiment, the S-shaped wirings of the unit pattern are provided so as to extend in a direction inclined at 45° with respect to the row direction, and in a direction inclined at 45° in the opposite direction with respect to the row direction, they may be provided so as to extend in the row direction and the column direction.
- In order to confirm the effects of the invention, the touch screen in the present embodiment and the touch screen in the second embodiment are manufactured, and a mutual capacitance type detection circuit is attached to each of the touch screens to conduct touch detection with a finger. In the touch screen in the present embodiment as well, position coordinates of a touch position can be precisely detected as with the touch screen in the second embodiment.
- Moreover, in order to confirm the visibility of the touch screens, the touch screen in the present embodiment and the touch screen in the second embodiment are visually observed under direct sunshine having an illuminance of 80000 lux, and consequently, in the touch screen in the present embodiment, glittering by reflected light of the wiring is more lessened. This is because the unit pattern of the wiring is circular arc-shaped, thereby allowing the reflected light to be reflected in various directions.
- In the touch screen in the present embodiment, at least part of the unit pattern of the mesh-like wiring includes the circular arc shaped wiring.
- Accordingly, in addition to the effects described in the second embodiment, part of the unit pattern is made the circular arc-shaped wiring, by which outside light can be scattered in various directions, as compared with the case where the unit pattern is linear, thereby suppressing glittering by the reflection of the outside light.
- Moreover, in the touch screen in the present embodiment, the mesh-like wiring is made of the unit pattern, and in the unit pattern, all the wiring is formed of the circular arc-shaped wiring.
- Accordingly, shaping all the wiring into circular arcs allows the outside light to be more effectively scattered in various directions, which can further suppress the glittering by the reflection of the outside light.
- Moreover, in the touch screen in the present embodiment, the mesh-like wiring is made of the unit pattern, and the unit pattern includes the S-shaped wirings intersecting with each other and the circular wiring around the intersection of the S-shaped wirings.
- Accordingly, the circular wiring more effectively allows the outside light to be scattered in various directions, which can further suppress the glittering by the reflection of the outside light.
- While the present invention has been described in detail, the above description is illustrative in all aspects, and the present invention is not limited thereto. It should be understood that a number of modifications not illustrated can be supposed without departing from claims.
- 1 touch screen
- 8 terminal
- 10 transparent substrate
- 11 interlayer insulation film
- 12 protective film
- 20 lower electrode
- 21 row-direction wiring
- 21 a floating wiring
- 21 b, 21 c, 33 a disconnection portion
- 22 column-direction dummy wiring, disconnection portion
- 22 column-direction dummy wiring
- 30 upper electrode
- 31 column-direction wiring
- 32 disconnection portion wiring
- 33 row-direction dummy wiring
- 40 dummy lead wiring
- E1 first portion
- E2 second portion
- W1, W2, Wc wiring width
- M2 length in a row direction
Claims (9)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP2012-211754 | 2012-09-26 | ||
JP2012211754 | 2012-09-26 | ||
PCT/JP2013/070969 WO2014050306A1 (en) | 2012-09-26 | 2013-08-02 | Touch screen |
Publications (2)
Publication Number | Publication Date |
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US20150242013A1 true US20150242013A1 (en) | 2015-08-27 |
US9477362B2 US9477362B2 (en) | 2016-10-25 |
Family
ID=50387720
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US14/427,080 Active 2033-08-19 US9477362B2 (en) | 2012-09-26 | 2013-08-02 | Touch screen covered with wiring pattern having first and second layers |
Country Status (5)
Country | Link |
---|---|
US (1) | US9477362B2 (en) |
JP (1) | JP5875693B2 (en) |
CN (1) | CN104685453B (en) |
DE (1) | DE112013004719T5 (en) |
WO (1) | WO2014050306A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
DE112013004719T5 (en) | 2015-06-03 |
WO2014050306A1 (en) | 2014-04-03 |
CN104685453A (en) | 2015-06-03 |
JP5875693B2 (en) | 2016-03-02 |
JPWO2014050306A1 (en) | 2016-08-22 |
CN104685453B (en) | 2017-06-13 |
US9477362B2 (en) | 2016-10-25 |
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